WO2007097150A1 - Capteur optique, lecteur de disque optique et dispositif d'informations optiques - Google Patents

Capteur optique, lecteur de disque optique et dispositif d'informations optiques Download PDF

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Publication number
WO2007097150A1
WO2007097150A1 PCT/JP2007/050982 JP2007050982W WO2007097150A1 WO 2007097150 A1 WO2007097150 A1 WO 2007097150A1 JP 2007050982 W JP2007050982 W JP 2007050982W WO 2007097150 A1 WO2007097150 A1 WO 2007097150A1
Authority
WO
WIPO (PCT)
Prior art keywords
lens
spherical aberration
rising mirror
optical
optical pickup
Prior art date
Application number
PCT/JP2007/050982
Other languages
English (en)
Japanese (ja)
Inventor
Keiichi Matsuzaki
Yoshiaki Komma
Toshiyasu Tanaka
Kousei Sano
Kanji Wakabayashi
Hidenori Wada
Original Assignee
Matsushita Electric Industrial Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co., Ltd. filed Critical Matsushita Electric Industrial Co., Ltd.
Priority to US12/946,126 priority Critical patent/USRE43540E1/en
Priority to CN2007800068464A priority patent/CN101390161B/zh
Priority to US12/280,601 priority patent/US7773304B2/en
Priority to BRPI0708290-8A priority patent/BRPI0708290A2/pt
Priority to JP2008501647A priority patent/JP4505533B2/ja
Priority to EP07707245A priority patent/EP1993092A4/fr
Publication of WO2007097150A1 publication Critical patent/WO2007097150A1/fr

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1353—Diffractive elements, e.g. holograms or gratings
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1362—Mirrors
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1372—Lenses
    • G11B7/1376—Collimator lenses
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1392—Means for controlling the beam wavefront, e.g. for correction of aberration
    • G11B7/13925—Means for controlling the beam wavefront, e.g. for correction of aberration active, e.g. controlled by electrical or mechanical means
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B2007/0003—Recording, reproducing or erasing systems characterised by the structure or type of the carrier
    • G11B2007/0009—Recording, reproducing or erasing systems characterised by the structure or type of the carrier for carriers having data stored in three dimensions, e.g. volume storage
    • G11B2007/0013—Recording, reproducing or erasing systems characterised by the structure or type of the carrier for carriers having data stored in three dimensions, e.g. volume storage for carriers having multiple discrete layers

Definitions

  • Optical pickup, optical disk drive device, and optical information device are Optical pickup, optical disk drive device, and optical information device
  • the present invention relates to an optical pickup device using a spherical aberration correction mechanism using a lens driving device that enables a lens constituting the optical pickup device to move in the optical axis direction, and the optical pickup.
  • the present invention relates to an optical disk drive device and an optical information device.
  • An optical disc apparatus includes an optical pickup for forming a beam spot on an information recording surface of an optical disc.
  • an optical beam emitted from a light source is affected by spherical convergence when passing through a transparent protective substrate layer that protects an information recording layer of an optical disc.
  • Patent Document 1 in order to reduce the influence of this spherical aberration, a lens group for correcting spherical aberration is provided, and a variable gap is provided between the surfaces of a pair of sequential lens elements in the lens group. And a device for varying the gap interval by a mechanical method is disclosed.
  • FIGS. 8A and 8B are diagrams schematically showing a configuration of an example in which the conventional lens driving device in Patent Document 1 is applied to an optical pickup, and FIG. 8A is a plan view of the optical pickup.
  • FIG. 3 is a side view of the optical pickup.
  • 114 is an optical disk
  • 101 is a laser diode as a light source
  • 102 is a collimating lens
  • 103 is a beam splitter
  • 104 is a rising mirror
  • 105 is an objective lens
  • 106 is a detection lens
  • 107 is a photoelectric sensor.
  • the light beam emitted from the laser diode 101 passes through the beam splitter 103 and the collimator lens 102, is deflected in the direction of the optical disk 114 by the rising mirror 104, and is an objective lens The light is focused on the recording surface of the optical disk 114 by 105.
  • Optical beam reflected from the surface of optical disk 114 The light passes through the objective lens 105, is deflected by the rising mirror 104, passes through the collimator lens 102, is deflected by the beam splitter 103, and is focused on the light receiving surface of the photodetector 107 by the detection lens 106.
  • the collimating lens 102 is a lens for correcting the diffusion and convergence of the light beam by moving the position in the optical axis direction.
  • the collimating lens 102 is held by a lens holder 108, and the lens holder 108 is supported by a pair of guide shafts 109 and a sliding shaft 110.
  • the guide shaft 109 and the sliding shaft 110 are fixed to the shaft holding member 113.
  • the guide shaft 109 and the sliding shaft 110 are arranged so that the extending direction of the shaft is parallel to the optical axis of the collimating lens 102.
  • the lens holder 108 is slidably engaged with the guide shaft 109 and the sliding shaft 110.
  • the collimating lens 102 can move in the optical axis direction when the lens holder slides along the guide shaft 109 and the sliding shaft 110.
  • a drive mechanism (not shown) including a gear, a stepping motor, and the like is provided.
  • the sliding shaft 110 slides in the thrust direction in response to the driving force of the driving mechanism, the lens holder 108 moves in the optical axis direction.
  • Patent Document 1 Japanese Patent Laid-Open No. 2004-77705
  • multilayer recording disks having various protective layer thicknesses have been proposed as next-generation technologies, and a spherical aberration correction mechanism with a wider correction range is being demanded of optical pickups.
  • the present invention provides an optical pickup that is smaller than the conventionally proposed optical pickup, has a wide spherical aberration correction range, and an optical disc drive device and an optical information device using the optical pickup. Objective.
  • the present invention is configured as follows.
  • the objective lens that condenses the light emitted from the light source on the information recording surface of the information recording medium
  • a spherical aberration correction lens configured to correct a spherical aberration of a light beam condensed on the information recording surface by the objective lens, wherein one surface has a larger curvature than the other surface; and the spherical aberration correction lens.
  • a rising mirror that deflects the emitted light that has passed therethrough and guides it to the incident surface of the objective lens;
  • the spherical aberration correcting lens is configured to be thinner than the maximum thickness width, and the surface having the large curvature is protruded partially in a state where the surface having the large curvature faces the rising mirror side.
  • a guide member that extends in the optical axis direction of the spherical aberration correction lens and whose end is disposed to the side of the rising mirror reflecting surface;
  • a sliding portion that is fixed to the lens holder and slides along the guide member in a state of protruding to the rising mirror side;
  • the protruding portion of the sliding portion is accommodated on the side surface of the rising mirror reflecting surface, so that the protruding portion of the spherical aberration correction lens from the lens holder is Provided is an optical pickup configured such that the spherical aberration correction lens and the rising mirror can be approached until they overlap the reflecting surface of the rising mirror.
  • the spherical aberration correction lens may be a collimating lens that converts the emitted light from the light source into parallel light, or the emitted light from the light source is the object lens. It may be provided in a beam expander that converts the beam diameter when entering the beam. [0015]
  • the spherical aberration correction lens may include a color correction element! /.
  • the spherical aberration correction lens may be configured to be flat in the height direction.
  • the guide member is composed of a pair of shafts provided in parallel to each other, and is fixed to the lens holder in a state of projecting to the rising mirror side.
  • the optical pickup according to the first aspect is provided in which only one shaft with which the sliding portion engaged is extended to the side of the rising mirror.
  • the guide member is composed of a pair of shafts provided in parallel to each other, and is fixed to the lens holder in a state of protruding toward the rising mirror side.
  • the first aspect of the optical pickup further includes a spring that urges the lens holder toward the rising mirror side on one shaft with which the sliding portion is engaged.
  • the guide member is arranged to extend to the side of the rising mirror reflecting surface, and the sliding portion that moves along the guide member is more than the lens holder. Since it is configured to project to the rising mirror side, the spherical aberration correction lens can be moved to the position close to the rising mirror, and the movement range can be increased. Therefore, it is possible to increase the correction range of the spherical aberration.
  • the spherical aberration correction lens is configured to protrude toward the rising mirror with respect to the lens holder, the protruding portion of the spherical aberration correction lens on the reflecting surface of the rising mirror provided at an inclination. Can be placed in an overlapping state. Therefore, it can be suitably used for an information recording medium having two or more information recording layers that require a large range of spherical aberration correction.
  • the optical pickup can be made smaller than the absolutely required movement width. Therefore, it can be made smaller than the conventional technology.
  • the sliding portion is configured to protrude with respect to the lens holder, it is possible to prevent the lens holder from blurring with respect to the guide member.
  • both the spherical aberration correction lens and the sliding portion protrude toward the rising mirror with respect to the lens holder, the centers of gravity of these lenses are close to each other. A moment is applied.
  • spherical aberration compensation to the lens holder When the positive lens is attached, since the spherical aberration correction lens protrudes from the lens holder, it is possible to prevent forgetting to attach the lens with high visibility.
  • one uses a lens with a large curvature it is easy to check the front and back mounting direction of the lens that is visually attached.
  • FIG. 1A is a plan view schematically illustrating the configuration of the optical pickup according to the first embodiment of the invention.
  • FIG. 1B is a side view schematically illustrating the configuration of the optical pickup according to the first embodiment of the present invention.
  • Fig. 2 is a plan view specifically showing the positional relationship of the lens holder when the collimating lens is moved.
  • FIG. 3A is a diagram showing a state in which the lens holder unit and the collimating lens used in the optical pickup of FIG. 1A are viewed from the optical axis direction of the collimating lens.
  • FIG. 3B is a diagram showing a state in which the lens holder unit and the collimating lens, which are useful for the modification used in the optical pickup of FIG. 1A, are viewed from the optical axis direction of the collimating lens.
  • FIG. 4A is a diagram schematically showing a modification of the collimating lens applicable to the optical pickup of FIG. 1A.
  • FIG. 4B is a diagram schematically showing a modification of the collimating lens applicable to the optical pickup of FIG. 1A.
  • FIG. 5 is a diagram showing a configuration of an optical disk drive equipped with the optical pickup of FIG. 1A.
  • FIG. 6 is a plan view schematically illustrating the configuration of the optical pickup according to the second embodiment of the invention.
  • FIG. 7A is a plan view schematically illustrating the configuration of the optical pickup according to the third embodiment of the invention.
  • FIG. 7B is a side view schematically illustrating the configuration of the optical pickup according to the third embodiment of the present invention.
  • FIG. 8A is a schematic diagram showing the structure of a conventional optical pickup disclosed in Patent Document 1,
  • FIG. 8B is a schematic diagram showing the structure of a conventional optical pickup disclosed in Patent Document 1.
  • FIG. 1 is a schematic diagram for explaining the configuration of an optical pickup that is useful in the first embodiment of the present invention.
  • FIG. 1A is a plan view of the optical pickup
  • FIG. 1B is a side view of the optical pickup.
  • 14 is an optical disk as an information recording medium
  • 1 is a laser diode as a light source
  • 2 is a collimating lens as a spherical aberration correction lens
  • 3 is a beam splitter
  • 4 is a rising mirror
  • 5 is an objective lens.
  • 6 is a detection lens
  • 7 is a light detector such as a photoelectric conversion element.
  • Reference numeral 20 is a stepping motor
  • 21 is a ball screw. Note that the objective lens 5 and the optical disk 14 are not shown in the plan view of FIG. 1A.
  • the light beam emitted from the laser diode 1 passes through the beam splitter 3 and the collimating lens 2 in this order, and is deflected in the direction of the optical disk 14 by the rising mirror 4 to be objective.
  • the light is focused on the optical disk 14 by the lens 5 as a light spot.
  • information is recorded on the information recording surface of the optical disc 14 or the information recorded on the information recording surface of the optical disc 14 is read.
  • the light beam reflected by the optical disk 14 passes through the objective lens 5, is deflected by the rising mirror 4, passes through the collimator lens 2, is deflected by the beam splitter 3, and is detected by the detection lens 6.
  • the light is condensed on the light receiving surface of the optical device 7, and the information from the information recording surface of the optical disk 14 is converted into an electric signal.
  • the collimating lens 2 is configured such that one surface is a flat surface and the other surface has a central portion. It is a convex lens configured to be convex.
  • the first guide shaft 11 and the second guide shaft 12 are arranged so as to be parallel to the optical axis L of the collimating lens 2. Both guide shafts 11 and 12 are fixed to shaft holding portions 13a and 13b at both ends thereof.
  • the shaft holding portion 13a of the first guide shaft 11 is provided at a downstream position in the optical axis direction of the beam splitter 3 and at a lateral position of the rising mirror 4.
  • the first guide shaft 11 extends between shaft holding portions 13a provided at the position.
  • the shaft holding portions of the second guide shaft 12 are provided at the downstream end portion of the beam splitter 3 in the optical axis direction and the upstream end portion of the rising mirror 4 in the optical axis direction, respectively. Therefore, the second guide shaft 12 extends between the beam splitter 3 and the rising mirror 4.
  • the collimating lens 2 is moved along the first guide shaft 11 and the second guide shaft 12 to converge the parallel light flux incident on the objective lens 5.
  • the difference in the protective layer thickness V of the optical disk 14 and the spherical aberration at the spot position caused by the spherical aberration of the optical pickup are adjusted to be below the allowable value. That is, when the distance from the light source 1 is equal to the focal length of the collimating lens 2, the collimating lens 2 turns the light beam that has passed through the collimating lens 2 into parallel light. Also, the light beam is diverged when the distance from the light source 1 is shorter than the focal length of the collimating lens 2, while the light beam is converged when the distance from the light source 1 is longer than the focal length of the collimating lens 2. Function.
  • the lens holder unit 8 includes a lens holder body 9 that holds the collimating lens 2, and first and second sliding portions 15 and 16 that engage with the first and second guide shafts 11 and 12. Composed.
  • the lens holder body 9 is a frame-like member that holds the collimating lens 2 so that the curved surface side of the collimating lens faces the rising mirror 4 side.
  • the thickness dimension of the lens holder main body 9 is configured to be smaller than the maximum thickness dimension of the collimating lens 2, and when the lens holder main body 9 force S collimating lens 2 is held, the collimating lens 2 becomes the lens holder main body. It rises from 9 and protrudes to the mirror 4 side.
  • the surface of the lens holder body 9 on the beam splitter 3 side is a flat surface.
  • the first and second sliding portions 15, 16 are slidably engaged along the first guide shaft 11 and the second guide shaft 12 as guide members.
  • the dimension of the first sliding portion 15 is configured to be thicker than the thickness dimension of the collimating lens 2 in the optical axis direction.
  • the first sliding portion 15 is fixed to the lens holder body 9 so as to protrude toward the downstream side in the optical axis direction with respect to the collimating lens 2.
  • the second sliding portion 16 is configured with a thickness dimension substantially the same as that of the lens holder body 9. This is because if the second sliding portion 16 is configured to be long in the axial direction, friction increases when the lens holder unit 8 is moved, which affects the movement of the lens holder unit.
  • the second sliding portion 16 is screwed onto a ball screw 21 that can be rotated by a stepping motor 20 that is a driving force generation source.
  • a stepping motor 20 that is a driving force generation source.
  • the ball screw 21 is driven via the gears 22 and 23, and the lens holder unit 8 is moved when the relative position of the second sliding portion 16 and the ball screw 21 is changed.
  • FIG. 2 is a plan view specifically showing the positional relationship of the lens holder when the collimating lens is moved.
  • Fig. 2 (b) shows the state where the collimating lens 2 is located at a substantially central position.
  • Figs. 2 (a) and 2 (c) show the collimating lens 2 on the rising mirror 4 side and the beam splitter 3 side, respectively. Indicates the state of movement.
  • the collimator lens functions so as to converge light of three beams.
  • the spherical aberration is corrected so that the focal point is closer to the surface of the optical disk 14. Since one end of the first guide shaft 11 is extended to the side of the rising mirror 4, the first sliding shaft is moved when the collimating lens 2 is closest to the rising mirror 4 side. Moving part 15 is set up on the side of mirror 4 It has become so.
  • the collimating lens 2 protrudes toward the rising mirror 4 than the lens holder 8
  • the collimating lens are arranged so that the protruding part overlaps with the reflecting surface of the rising mirror 4 so as to overlap. That is, even when the lens holder is arranged so as to be very close to the raising mirror 4, the collimating lens 2 does not contact the surface of the raising mirror 4. Therefore, the collimating lens 2 can be moved to a position very close to the raising mirror 4.
  • the collimating lens 2 can be moved to a position very close to the mirror 4, and the movable range of the collimating lens 2 can be increased. Can be bigger.
  • larger spherical convergence correction can be performed even in a small space where the movable range of the collimating lens 2 is large.
  • the collimating lens when the collimating lens is closest to the beam splitter 3 side, it functions to diverge the light from the beam splitter 3. In this state, the spherical aberration is corrected so that the optical disc 14 is focused in the depth direction in the thickness direction.
  • the surface on the beam splitter 3 side of the lens holder unit 8 is formed in a substantially flat surface without protrusion, so the lens holder unit is moved to the very vicinity of the collimating lens 3. And the movable range can be increased.
  • the spherical aberration correction amount is increased for the same size as compared with the case where this configuration is not employed. That power S.
  • the size of the height direction can be reduced by configuring the shape of the collimating lens to be flat in the height direction in the optical pickup of the present embodiment.
  • FIG. 3A shows a state in which the lens holder unit 8 and the collimating lens 2 are viewed from the optical axis direction of the collimating lens 2.
  • the lens holder and the collimating lens when the lens surface of the collimating lens 2 is circular are shown.
  • the amount by which the height direction of the collimating lens 2a and the lens holder main body 9a is decreased is, for example, the length of the operating range of the lens shift in the radial direction of the objective lens.
  • an oval lens may be created in advance, or the upper and lower positions of a circular lens may be cut!
  • FIGS. 4A and 4B are diagrams schematically showing a modification of the collimating lens applicable to the optical pickup according to the embodiment of the present invention.
  • the collimating lenses 2b and 2c shown in FIGS. 4A and 4B are characterized in that diffractive optical elements 25b and 25c for correcting chromatic aberration are formed on the entrance surface or exit surface of the lens.
  • the collimating lens 2b shown in FIG. 4A has a configuration in which the diffractive optical element 25b is integrally formed with the collimating lens 2b.
  • the collimating lens 4 shown in FIG. 4B is a lens in which the diffractive optical element 25c is attached to the surface with the smaller curvature (the left surface in the figure), and the color correction element 26 is provided in a body. It is the composition which is done.
  • the diffractive optical element can be provided on both the incident side and the emission side of the collimating lens.
  • FIG. 5 is a diagram showing a configuration of an optical disc drive for explaining an application example of the optical pickup shown in FIG. 1A, and 50 shows an optical pickup unit having the configuration shown in FIG.
  • the optical pickup unit 50 is configured to be movable in the radial direction of the disk 14 by a pickup movement drive mechanism 51.
  • the pickup movement drive mechanism 51 includes a seek motor 52 and a lead screw 53 that are power sources. It has.
  • the pickup unit 50 is supported by guide rails 54 and 55 extending in the radial direction of the disk. When the lead screw 53 rotates by moving to the seek motor 52, the pickup unit 50 is moved along the guide rails 54 and 55. Moving.
  • the spindle motor 40 is a motor that rotates the optical disk 14. Information is read from and recorded on the optical disk 14 by moving the optical pickup 50 in the seek direction while rotating the optical disk 14 by the spindle motor 40.
  • the optical pickup that can be used in the present embodiment can be configured in a small size, if an optical disc drive equipped with the optical pickup is applied to an optical information device, the optical pickup is small and has high performance. An optical information device can be obtained.
  • FIG. 6 is a schematic diagram for explaining the configuration of an optical pickup that is useful in the second embodiment of the present invention.
  • a laser diode 1 as a light source, a collimating lens 2 as a spherical aberration correction lens, a beam splitter 3, a raising mirror 4, an objective lens 5, a photoelectric conversion element, etc. Since the motor 20 and the ball screw 21 have the same configuration as in the first embodiment, description thereof is omitted.
  • 31 is a light quantity monitor for detecting the light quantity of the laser diode 1 by detecting the light quantity reflected by the optical disk 14.
  • the position near the objective lens of the casing 30 is notched so that the spindle motor 40 and the casing 30 do not interfere with each other! Is provided.
  • the spindle motor 40 is fitted into the notch 33, and the objective lens of the optical pickup can be arranged up to the vicinity of the spindle motor. Therefore, it is possible to read / write information at a position near the center of the optical disk 14.
  • the light beam emitted from the laser diode 1 is reflected and deflected by the beam splitter 3, passes through the collimator lens 2, and deflected in the direction of the optical disc 14 by the rising mirror 4 Then, it is condensed on the optical disk 14 as a light spot by an objective lens (not shown). As a result, the information recording surface of the optical disk 14 The information is recorded on the optical disc 14 or the information recorded on the information recording surface of the optical disc 14 is read out.
  • the light beam reflected by the optical disk 14 passes through the objective lens, is deflected by the rising mirror 4, passes through the collimator lens 2, passes through the beam splitter 3, and passes through the light receiving surface of the photodetector 7.
  • the light is collected and information from the information recording surface of the optical disk 14 is converted into an electrical signal.
  • the first guide shaft 41 and the second guide shaft 42 are arranged so as to be parallel to the optical axis L of the collimating lens 2. Both guide shafts 11 and 12 are fixed to shaft holding portions 43a and 43b at both ends thereof.
  • the shaft holding portion 43a of the first guide shaft 41 is provided at the downstream end portion in the optical axis direction of the beam splitter 3 and the upstream end portion in the optical axis direction of the rising mirror 4, respectively. Since the first guide shaft 41 is provided at a position close to the spindle motor 40 with respect to the collimating lens 2, in the optical pickup having the cutout 33, the side of the rising mirror is provided for the cutout 33. It is made not to arrange in. On the other hand, the shaft holding portion 43b of the second guide shaft 42 is provided at the downstream end portion in the optical axis direction of the beam splitter 3 and the side orientation of the rising mirror 4, respectively.
  • the collimating lens 2 is moved along the first guide shaft 11 and the second guide shaft 12 to converge the parallel light flux incident on the objective lens 5.
  • the difference in the protective layer thickness V of the optical disk 14 and the spherical aberration at the spot position caused by the spherical aberration of the optical pickup are adjusted to be below the allowable value.
  • the lens holder unit 32 includes a lens holder main body 9 that holds the collimating lens 2, and first and second sliding portions 35 and 36 that engage with the first and second guide shafts 41 and 42. Composed.
  • the lens holder body 9 holds the collimating lens 2 so that the curved surface side of the collimating lens faces the rising mirror 4 side.
  • the collimating lens 2 rises from the lens holder 8 and protrudes toward the mirror 4.
  • the surface of the lens holder body 9 on the beam splitter 3 side is a flat surface.
  • the first and second sliding portions 35, 36 are slidably engaged along the first guide shaft 41 and the second guide shaft 42 as guide members.
  • the dimension of the second sliding portion 36 is smaller than the thickness dimension of the collimating lens 2 in the optical axis direction in order to suppress the tilt due to the backlash of the collimating lens 2 in the optical axis direction. Make it thick. Further, the second sliding portion 36 is fixed to the lens holder body 9 so as to protrude downstream in the optical axis direction with respect to the collimating lens 2. By configuring the second sliding portion 36 to be long in the extending direction of the guide shaft 42, the backlash in the optical axis L direction of the collimating lens 2 can be reduced.
  • the second guide shaft 42 is provided with a spring 39, which raises the lens holder unit 32 and biases it toward the lens 4.
  • a spring 39 which raises the lens holder unit 32 and biases it toward the lens 4.
  • the second sliding portion 36 has a connecting portion 37 that is screwed into a ball screw 21 that can be rotated by a stepping motor 20 that is a driving force generation source.
  • a stepping motor 20 When the stepping motor 20 is driven to rotate, the ball screw 21 is driven through the gears 22 and 23, and the relative position between the second sliding portion 36 and the ball screw 21 is changed, so that the lens holder unit 8 is moved.
  • the optical pickup that works well with the present embodiment is also configured so that the second sliding portion 36 fits on the side surface of the raising mirror 4 when the collimating lens is closest to the raising mirror 4 side.
  • the protruding part of the collimating lens is arranged so as to overlap the reflecting surface of the rising mirror 4. Therefore, the collimating lens 2 can be moved to a position very close to the raising mirror 4, and the movable range of the collimating lens 2 can be increased.
  • the lens holder unit 8 on the beam splitter 3 side is configured to be a substantially flat surface without protrusion, the lens holder unit can be moved to the very vicinity of the collimating lens 3 and is movable. The range can be increased.
  • the size in the height direction can be reduced by forming the shape of the collimator lens flat in the height direction as shown in FIG. 3B. Also figure Collimating lenses 2b and 2c in which diffractive optical elements 25b and 25c for correcting chromatic aberration are formed on the entrance surface or exit surface of the lens shown in 4A and FIG. 4B can also be used.
  • FIG. 7A and 7B are schematic views showing the configuration of the optical pickup according to the third embodiment of the present invention.
  • FIG. 7A is a plan view of the optical pickup
  • FIG. 7B is a side view of the optical pickup. It is.
  • the laser diode 1, the beam splitter 3, the rising mirror 4, the objective lens 5, the photoelectric detector, and other powerful photodetectors 7, the stepping motor 20, and the ball screw 21 are used as the light source. Since it has the same configuration as that of the first embodiment, description thereof is omitted.
  • 31 is a light amount monitor for detecting the light amount of the laser diode 1 by detecting the light amount reflected from the optical disk 14.
  • the collimator lens 2 for making the laser light parallel light is fixed.
  • a beam expander unit 60 is provided between the collimator lens 2 and the raising mirror for changing the beam system of the light beam having the light source power.
  • the beam expander unit 60 functions as a spherical aberration correction lens.
  • the beam expander unit 60 includes two lenses, a first lens located on the beam splitter 3 side and a second lens located on the rising mirror 4 side.
  • the first lens 63 is fixed, and the second lens 64 is configured to be movable in the optical axis L direction.
  • the light beam emitted from the laser diode 1 is reflected and deflected by the beam splitter 3, passes through the collimator lens 2 and the beam expander unit 60, and rises to the mirror 4. Is deflected in the direction of the optical disc 14 and is focused on the optical disc 14 as a light spot by an objective lens (not shown). As a result, information is recorded on the information recording surface of the optical disc 14 or the information recorded on the information recording surface of the optical disc 14 is read.
  • the light beam reflected by the optical disk 14 passes through the objective lens, is deflected by the rising mirror 1, passes through the beam expander unit 60 and the collimator lens 2, passes through the beam splitter 3, and detects light.
  • the light is collected on the light receiving surface of the device 7 and information on the information recording surface force of the optical disk 14 is converted into an electric signal.
  • the first lens 63 of the beam expander unit 60 is a convex lens configured such that both surfaces are curved
  • the second lens 64 is configured such that one surface is a flat surface and the other surface is the other surface. It is a convex lens configured such that the central portion is convex.
  • the first lens 63 is held and fixed by the first lens holder 62.
  • the first lens holder 62 is configured to have the same or larger thickness than the first lens 63, and the first lens 62 is configured not to protrude from the first lens holder.
  • the second lens 64 is fixed to the second lens holder main body 9d, which is a constituent member of the lens holder unit 8d.
  • the configuration of the lens holder unit 8d will be described in detail later.
  • the first guide shaft 71 and the second guide shaft 72 are arranged so as to be parallel to the optical axis L of the collimating lens 2. Both guide shafts 71 and 72 are fixed to shaft holding portions 73a and 73b at both ends thereof.
  • the shaft holding portion 73a of the first guide shaft 71 is provided at the downstream position of the first lens 63 in the optical axis direction and the upstream end portion of the rising mirror 4 in the optical axis direction. Further, the shaft holding portion 73b of the second guide shaft 72 is provided at the upstream end portion of the first lens 63 in the optical axis direction and at the side position of the rising mirror 4, respectively. Note that the shaft holding portion 73b of the second guide shaft 72 extends to the upstream end of the first lens 63 in the optical axis direction, and is positioned upstream of the end of the first guide shaft. As will be described later, this is for securing a space for accommodating the spring 39 when the lens holder unit 9d is closest to the first lens 63.
  • the second lens 64 is moved along the first guide shaft 11 and the second guide shaft 12 to change the distance between the first and second lenses.
  • the spherical aberration is adjusted by converging or diverging.
  • the lens holder unit 8d includes a lens holder main body 9d that holds the second lens 64, and first and second sliding portions 15d and 16d that engage with the first and second guide shafts 71 and 72. And a connecting portion 17d connected to the second sliding portion.
  • the lens holder body 9 is a frame-like member that holds the second lens 64 so that the curved surface side of the second lens 64 faces the rising mirror 4 side.
  • the thickness dimension of the second lens holder body 9d is configured to be smaller than the maximum thickness dimension of the second lens 64.
  • the dimension of the second sliding portion 16d is the thickness of the second lens 64 in the optical axis direction. Construct thicker than the dimensions. Further, the second sliding portion 16d is fixed to the lens holder body 9d so as to protrude toward the downstream side in the optical axis direction with respect to the second lens 64. By configuring the second sliding portion 16d to be long in the extending direction of the guide shaft 72, the backlash in the optical axis L direction of the collimating lens 2 can be reduced.
  • the second guide shaft 72 is provided with a spring 39, which raises the lens holder unit 9d in the direction of the lens 4!
  • a spring 39 which raises the lens holder unit 9d in the direction of the lens 4!
  • the second sliding portion 16d is screwed into a rotatable ball screw 21 by a stepping motor 20 which is a driving force generation source, and is connected to the connecting portion 17d.
  • a stepping motor 20 which is a driving force generation source, and is connected to the connecting portion 17d.
  • the ball screw 21 is driven via the gears 22 and 23, and when the relative position between the second sliding portion 16d and the ball screw 21 is changed, the lens holder unit 8d is moved. .
  • the second sliding portion 16d fits on the side surface of the raising mirror 4 when the second lens 64 is closest to the raising mirror 4 side.
  • the collimating lens is arranged so that the protruding portion of the collimating lens overlaps the reflecting surface of the rising mirror 4. Therefore, the second lens 64 can be raised to a position very close to the mirror 4 and the movable range of the second lens 64 can be increased.
  • the surface of the lens holder unit 8d on the first lens 63 side is configured to be a substantially flat surface that does not protrude, and the first lens 63 is configured not to protrude from the first lens holder 62. Therefore, the lens holder unit 8d can be moved to the very vicinity of the first lens holder 62, and the movable range of the lens holder unit 8d can be increased.
  • the shape of the lens constituting the beam expander unit 60 is flattened in the height direction, so that the size in the height direction can be reduced. Can be small. It is also possible to use a lens in which a diffractive optical element for correcting chromatic aberration is formed on the entrance surface or exit surface of the lens shown in FIGS. 4A and 4B.
  • the optical pickup in the present embodiment is applied to a double-layer disc or a future multi-layer disc having three or more layers, the optical pickup can be made compact.
  • the guide portion is provided on the lens holder side and the guide shaft slides.
  • the guide shaft may be joined to the lens holder side and the guide shaft may slide in the guide groove. .
  • optical pickup optical disk drive apparatus and optical information apparatus of the present invention are useful for an optical information recording / reproducing apparatus using an optical disk such as a magneto-optical recording apparatus or a CD, DVD, HD-DVD, Blu-ray disk apparatus. It is. It can also be applied to optical systems and devices for hologram recording devices and future ultra-high density recording / reproducing devices.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Head (AREA)

Abstract

La présente invention concerne un petit capteur optique ayant une large plage de correction d'aberration sphérique. Le capteur optique comprend un miroir montant (4) pour défléchir un faisceau lumineux de manière approximativement perpendiculaire et le diriger vers le plan d'incidence d'une lentille de focalisation, une lentille de correction d'aberration sphérique (2) ayant une courbure plus importante sur un côté que sur l'autre côté, un support de lentille (9) pour soutenir la lentille de correction d'aberration sphérique (2) de telle manière à ce que le plan de courbure plus importante dépasse partiellement vers le côté du miroir montant, des éléments de guidage (11, 42, 72) s'étendant dans la direction de l'axe optique (L) d'une lentille de correction d'aberration sphérique (s) et ayant une extrémité disposée jusqu'au côté du plan de réflexion du miroir montant (4), et des parties (15, 36, 16d) coulissant le long des éléments de guidage (11, 42, 72). Les parties saillantes des parties coulissantes (15, 36, 16d) sont disposées afin d'être confinées dans la face latérale du plan réfléchissant du miroir montant (4), et lorsque la lentille de correction d'aberration sphérique (2) s'approche au plus près du miroir montant (4), la partie de la lentille de correction d'aberration sphérique dépassant à partir du support de lentille se superpose au plan réfléchissant du miroir montant (4).
PCT/JP2007/050982 2006-02-27 2007-01-23 Capteur optique, lecteur de disque optique et dispositif d'informations optiques WO2007097150A1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US12/946,126 USRE43540E1 (en) 2006-02-27 2007-01-23 Optical pickup, optical disc drive device, and optical information device
CN2007800068464A CN101390161B (zh) 2006-02-27 2007-01-23 光学拾波器、光盘驱动装置和光信息装置
US12/280,601 US7773304B2 (en) 2006-02-27 2007-01-23 Optical pickup, optical disc drive device, and optical information device
BRPI0708290-8A BRPI0708290A2 (pt) 2006-02-27 2007-01-23 picape ótica dispositivo de acionamento de disco ótico, e dispositivo de informação ótica
JP2008501647A JP4505533B2 (ja) 2006-02-27 2007-01-23 光ピックアップ、光ディスクドライブ装置及び光情報装置
EP07707245A EP1993092A4 (fr) 2006-02-27 2007-01-23 Capteur optique, lecteur de disque optique et dispositif d'informations optiques

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2006050178 2006-02-27
JP2006-050178 2006-02-27

Publications (1)

Publication Number Publication Date
WO2007097150A1 true WO2007097150A1 (fr) 2007-08-30

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PCT/JP2007/050982 WO2007097150A1 (fr) 2006-02-27 2007-01-23 Capteur optique, lecteur de disque optique et dispositif d'informations optiques

Country Status (7)

Country Link
US (2) US7773304B2 (fr)
EP (1) EP1993092A4 (fr)
JP (1) JP4505533B2 (fr)
CN (1) CN101390161B (fr)
BR (1) BRPI0708290A2 (fr)
RU (1) RU2428750C2 (fr)
WO (1) WO2007097150A1 (fr)

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JP2008261790A (ja) * 2007-04-13 2008-10-30 Hitachi High-Technologies Corp 欠陥検査装置
JP2010134974A (ja) * 2008-12-02 2010-06-17 Panasonic Corp 光ピックアップ装置および光ピックアップ用レンズ
DE102011054277A1 (de) * 2010-10-08 2012-04-12 Electronics And Telecommunications Research Institute Kondenserlinsengekoppelte photoleitende Antennenvorrichtung für Terahertzwellenerzeugung und -erkennung sowie Herstellungsverfahren dafür
JP5967621B2 (ja) * 2013-11-13 2016-08-10 株式会社ソニー・インタラクティブエンタテインメント 光ディスク装置
JP6461609B2 (ja) * 2015-01-05 2019-01-30 株式会社ミツトヨ 干渉対物レンズ、および光干渉測定装置
CN206755076U (zh) * 2017-02-27 2017-12-15 漳州立达信光电子科技有限公司 一种可切换光束角的组合光学装置和led灯
CN108535831A (zh) * 2018-07-06 2018-09-14 中山联合光电科技股份有限公司 超声电机驱动的变焦光学系统
CN113131330B (zh) * 2021-03-31 2022-10-21 杭州耀芯科技有限公司 一种激光器发光功率监测系统、监测方法及其准直透镜

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Also Published As

Publication number Publication date
EP1993092A4 (fr) 2009-04-01
JP4505533B2 (ja) 2010-07-21
RU2428750C2 (ru) 2011-09-10
USRE43540E1 (en) 2012-07-24
RU2008138599A (ru) 2010-04-10
US7773304B2 (en) 2010-08-10
JPWO2007097150A1 (ja) 2009-07-09
CN101390161B (zh) 2012-05-30
US20090086330A1 (en) 2009-04-02
CN101390161A (zh) 2009-03-18
EP1993092A1 (fr) 2008-11-19
BRPI0708290A2 (pt) 2011-05-24

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